Single trigger for multiple barrel firearms



y 1954 R. F. HOLT SINGLE TRIGGER FOR MULTIPLE BARREL FIREARMS 6 Sheets-Sheet 1 Filed May 2, 1950 A7 7' ORA f Y July 20, 1954 R. F. HOLT SINGLE TRIGGER FOR MULTIPLE BARREL FIREARMS 6 Sheets-Sheet 2 Filed y 2, 1950 sw asfi sg w ii I 5 dc k I N V EN TOR.

A770/P/Vf) SINGLE TRIGGER FOR MULTIPLE BARREL FIREARMS Filed May 2, 1950 6 Sheets-Sheet 3 July 20, 1954 R. F. HOLT SINGLE TRIGGER FOR MULTIPLE BARREL FIREARMS 6 Sheets-Sheet 4 E'llfid May 2, 1950 MW? 7' ZQAL July 20, 1954 R. F. HOLT SINGLE TRIGGER FOR MULTIPLE BARREL FIREARMS 6 Sheets-Sheet 5 Filed May 2 1950 y 1954 R. F. HOLT SINGLE TRIGGER FOR MULTIPLE BARREL FIREARMS 6 Sheets-Sheet 6 Filed May 2, 1950 INVENTOR.

lei 2 4770/F/VE) Patented July 20 1954 UNITED STATES TENT OFFICE SINGLE TRIGGER FOR MULTIPLE BARREL FIREARMS 4 Claims.

This invention relates. to an. improvement in firearms such as of the multiple barrel type, but not so limited, in which a so called three barrel type having two barrels of similar bore and having a third barrel of smaller bore disposed above and parallel with the larger bore barrels to act as a sighting plane of said firearm can be used.

One object of the invention is to provide an improved firing mechanism which. is simple and economical in construction and effective in operation.

Solely for the purpose of an illustration of a preferred embodiment of this invention and not by way of limitation, which is only set forth in the appended claims, a detailed description of an arrangement in which the smaller bore barrel referred to above may be fired independently of the larger bore barrels and selectively in either order, and. the larger bore barrels which comprise a right barrel and a left barrel may be fired non-selective by a single trigger arrangement is given. However, the essential features of this invention can be used with single, double and other multiple barrel firearms by simple adaptations well within the skill of the art in which this invention is a part.

The invention accordingly consists in the features of construction, combination of elements, and arrangements of parts. which will be exemplified in the construction hereinafter set forth, and the scope of the application of which will be indicated in the appended claims.

This invention is. best understood by means of the following drawings in which like numbers designate the same element in each drawing.

Figure 1 is a cross sectional left hand side elevation taken substantially on line ll of Fig. 2 showing the barrel receiver, firing mechanism housing, trigger frame, the operation of the firing mechanism of the smaller bore top barrel, locking mechanism of said firearm and how the cooking mechanism operates to cook hammer and move safety bar into safety position when said firearm is broken open for loading and also how the extraction of shells is accomplished.

Figure 2 is a plan view taken substantially on the line 2--2 of Fig. 4 showing the firing mech nism housing with a portion of the top wall broken away to disclose the arrangement of hammers, main hammer springs, and firing pins of the multiple barrels, also showing cocking mechanism and extractor cam together with the operating arm for the single trigger mechanism.

Figure 3 is a right hand side elevation taken substantially on the line 33 of Fig. 2 showing the barrel receiver, the firing mechanism housing and trigger frame with a portion of the firing mechanism housing wall broken away disclosing the firing mechanism of the right barrel.

Figure 4 is a left hand side elevation taken substantially on the line l l of Fig. 2 showing the barrel receiver, firing mechanism housing, and trigger frame with a portion of the barrel receiver wall broken away disclosing part of the chamber opening and the upper locking recesses, two portions of the firing mechanism housing also being broken away disclosing lower locking lugs of barrel receiver, together with firing mechanism and single trigger mechanism.

Figure 5 is a right hand cross section elevation showing complete assembly and take down feature and also small housing to provide rigid support and alignment for barrels at muzzle end and to provide space for position of sight.

Figure 6 is a transverse sectional view taken substantially on the line 66 of Fig. 1 through the firing mechanism housing.

Figure 7 is a cross sectional view taken substantially on the line 1.'l of Fig. 1 to show the locking mechanism of said firearm.

Figure 8 is a perspective view showing the disposition of the sears, safety bar, trigger, single trigger mechanism, and single trigger operating arm when they are properly assembled into the trigger frame.

Figure 9 is a perspective. view showing the relative position at the major parts of the firing mechanism and the safety bar when the safety is in the firing position and the firearm is cocked and closed.

Figure 10 is an exploded view of the components of the locking mechanism.

Figure 11 is a perspective view showing the relative position of the major parts of the firing mechanism and the safety bar at the time that the firearm is at the maximum opening for cockmg.

Figure 12 is a perspective View showing the relative position of the major parts of the firing mechanism and safety bar when all barrels have been fired and the firearm is still closed.

Referring to the drawings in detail, Fig. 1 illustrates a barrel section (so termed for convenience) which includes a barrel receiver I havme three longitudinal holes bored through it, two on the same horizontal plane and parallel with each other and one on, an upper plane parallel with and equi-distant from the two aforementioned bores, the respective barrels being screwed or otherwise secured in the forward ends of these bores.

The barrel receiver has at its forward lower end and just below the under barrels a forwardly facing recess 2 which receives a hinge pin or member 3 extending between the side walls of the .ring mechanism housing 4. On the extreme forward end and centrally located on the bottom side of the barrel receiver I is another section which provides for a camming surface together with a threaded opening 1 provided for the take down mechanism stud 8.

The barrel receiver I also has a longitudinal hole 9 bored through just below and equi-distant.

from the two lower barrels and a recess It in the rear surface extending between the two lower barrels and upward to the upper barrel which together with the aforementioned hole provides room for the shell extractor H. An extractor cam l2 firmly secured in recesses in the side walls of the firing mechanism housing l by screws !3 and M- and also rigidly supported by top surface of pin 3 is provided for the operation of the extractor H. A recess I5 and a screw it provides a means to limit the travel of extractor H.

The cocking cam H is mainly rectangular having at its forward end a section extending forward beneath pin 3 and engaging the camming surface 6. The cocking cam IT is also provided with a slot through the main body which allows the cooking cam H to be slidably mounted by pin l8. Pin i8 has a hole bored transversely through its main body to allow the screw anchored pin it to freely pass through so as to guide and hold operating return spring 29 in correct position. The cocking cam I! has at its lower rear end a recess for the safety push rod 24 to be connected by screw 22.

The safety bar 23 has a body extending through opening of trigger piece 35 and into recess of safety finger frame 26 and is secured by screw 24 which also secures safety spring 25 in position.

The hammer 21 has an extended portion on the forward end extending through bore of the forward wall of the firing mechanism housing i to hold hammer in proper alignment and to engage rear surface of cooking cam IT. The hammer 2? also has an extended portion on rear end extending into bore through top portion of trigger piece to maintain hammer in proper alignment and to mount main hammer spring Ill. The hammer 2'? also has a lower abutment on the bottom surface to receive the engaging portion of the sear 28.

Sear 2-5 is mounted in trigger frame 35 by pivot pin 38. bottom surface and just adjacent to the pivot pin to allow the safety bar 23 to clear when the safety bar is moved forward into firing position. The sear 23 has a spring 29 mounted on its rearward end to engage top surface of trigger frame 35 and raise sear 23 upward so that engaging portion will engage and retain hammer 2'! in cocked position.

Trigger 32 mounted in trigger frame 35 by pivot pin 33 extends forward to engage top surface of scar 28.

Member 3 5 is threaded or otherwise retained in top rear wall of firing mechanism housing 4 having a transverse threaded opening 41 in vertical alignment with counterbored opening 48 in trigger frame 35 to receive screw 19 and also having a threaded bore in its rearward end to receive a stock pull up rod.

Unlocking lever 37 having two lugs 84 extending down into openings of part 39 has a threaded It also has a safety recess on the 4 hole in the bottom face of the forward end to receive screw 38 to firmly secure in position unlocking lever 31 and the part as. Part 39 has an extended portion extending rearward provided with a forked opening to slidably engage the screw pin t5 and return spring 55. Part 3% also has an opening to receive and secure locking bolt operating pin 40.

The locking bolt 41 has two parallel portions extending forward through two parallel openings in the forward wall of firing mechanism housing 4 to engage recesses of barrel receiver 1. It also has hammer engaging lugs on the bottom and on either side extending downward to engage right and left lower barrel hammers.

The firing mechanism housing ti has a counter bored opening in the upper area of the forward wall to receive firing pin 42 and firing pin return spring 53. The firing mechanism housing 2 also has a counterbored threaded opening in the top surface extending downward into the firing pin counterbored opening. A threaded pin it is mounted in the aforementioned opening and extends into recessed opening of firing pin 1-2 to retain it in proper position.

Referring now to Fig. 3, the hammer 5i has an extended portion on the forward end extend ing through the forward wall of the firing mechanism housing 4 to hold hammer in proper alignment and to engage cocking cam ll, an extends-1i portion rearward extending through and beyond rear wall of trigger frame 35 to maintain proper position and alignment of hammer, and to mount main hammer spring 52 and single trigger operating arm 53. The hammer 5! has an upper abutment to engage lug on looking bolt ti. A lower abutment is also provided in bottom surface of hammer 5| to receive engaging portion of scar 49.

Sear 49 mounted in trigger frame 35 by pivot pin 30 has a safety recess in the bottom surface just to the rear of the pivot pin to allow the safety bar 23 to clear when said safety bar is in the firing position. The scar 118 also has a spring 56 mounted on its rearward end to engage the top surface of trigger frame 35 and raise said sear upward so that engaging portion will engage the lower abutment of hammer 5i thereby.

The trigger 34 mounted in trigger frame 35 by pivot pin 33 is provided with a projection c2;- tending forward of the main body to engage top surface of the sear 49.

The threaded pin 54 in Fig. 3 is identical to the threaded pin 55 shown in Fig. 2, and extends through a counterbored opening in the side wall of firing mechanism housing 4 to extend into recessed opening of the firing pin (not shown but established symmetrically with firing pin 56) to retain it in proper position. Since the firing pin, firing pin return spring, and retaining threaded pin are identical and symmetrically mounted with those shown in Fig. l, for the left lower barrel, it was not deemed necessary to show these in detail.

Referring to Fig. 4, the hammer 55 has an extended portion extending forward and through the forward wall of the firing mechanism housing 1 to hold the hammer in proper alignment and to engage rear surface of cooking cam l? and an extended portion extending rearward into bore of rear wall of trigger frame 35 to maintain hammer in proper alignment and to mount main hammer spring 59. The hammer 58 also has a lower abutment in the bottom surface to receive engaging portion of scar 60 and an upper abutment to engage lug 85 on locking bolt 4!.

The sear 65 is mounted in trigger piece 35 by pivot pin 3% and has a safety recess in its bottom surface just to the rear of the pivot pin to allow the safety bar 23 to clear when it is in the firing position. The sear 6!! also has a spring 5! mounted on its rearward end to engage the top surface of trigger piece and raise sear upward so engaging portion of sear 553 will engage lower abutment of hammer 58 thereby retaining said hammer in cocked position.

The single trigger mechanism includes a part 62 mounted in trigger frame 35 by pin 33. The part 62 also has at its forward end a spring 63 firmly secured to engage the upper surface of trigger frame 35 so as to raise part 62 upward so that pin 84 when in forward position will be displaced substantially above the rearward end of sear 60. The aforementioned pin 64 is slidably mounted in a longitudinal bore in part 62 together with operating spring 65.

A pin 66 is threaded or otherwise established in a transverse opening in the mid section of pin 6 holding the forward end of bar 6'! in loose and movable connection with pin 54. The bar 6? extends rearwardly through an opening in the rear wall of trigger frame 35 to engage the forked opening of the operating arm 53. A member 58 is mounted in the rearward end of the bar 6? so as to seat in a concave recess in the rear surface of the operating arm 53.

Barrel receiver end cap 69 having a counterbored opening on either side is firmly secured to forearm piece ll by two similar screws such as screw 70.

Referring to Fig. 5, a threaded stud 8 being rigidly mounted in the threaded opening 1 of barrel receiver 5, is locked in position by a set screw or pin 12 and extends forward through and beyond the end cap 69.

The take down rod 13 having at its forward end a knurled piece 76 secured by a set screw or pin H and having on its rearward end a threaded bushing 75 secured by a set screw or pin it, extends through counterbored opening in forearm piece H.

The muzzle housing 78 is provided with three longitudinal bored openings to receive and hold the muzzle ends of the barrels rigidly and in proper alignment being locked in position by set screws or any other suitable means.

The operation of the firearm thus described is briefly as follows: referring to the drawings it is noted that Fig. 1, Fig. 3, and Fig. 4, will be used to illustrate the similarity of parts and the action of the three hammers, one hammer being shown in each view.

Referring now to Fig. l, the hammer 21 being in its cocked position is now ready to fire the top barrel. The operator first moves the safety finger piece 26 forward into firing position which also carries the safety bar 23 into alignment with the safety recess in the sear 28. A backward pull on trigger 32 causes it to pivot on pin 33 causing the engaging surface of trigger 32 to engage and swing sear 28 downward pivoting on pin 33 to disengage hammer 21. The main hammer spring 3| imparts forward motion to hammer 2? causing it to strike rearward end of firin pin 42 causing it to move forward and thus fire the center barrel. This is an individual action that can be executed at the will of the operator.

Referring to Figs. 3 and 4, the hammer 5! is in the cooked position and is now ready to fire right lower barrel. It should be noted here that the single trigger operating arm 53 being securely mounted on the rearward end of the hammer M is at rest in its rear extreme position holding the bar 6? by member 68 in its extreme rearward position. The operator moving the safety finger piece 26 forward brings the safety bar 23 into alignment with the safety recess in sear 49. A backward pull on the trigger 34 will cause it to pivot on pin 33 causing the engaging surface of trigger 34 to engage and swing sear 49 downward pivoting on pin 30, thus firing the right barrel. Referring briefly to Fig. 8, it is noted that at the same time the above action is occurring the part 82 pivoting on pin 33 also is forced downward by trigger 34. It should be noted here that the trigger 34 at all times engages the sear d9 directly and the part 62 directly but at no time does it engage sear 6D. This is important in that the single trigger feature is dependent on this action.

Referring now to Fig. 4, assuming that trigger 3a is still held in fired position by the operator's finger and the right lower barrel has been fired,

the single trigger operating arm 53 has been carried to and is at rest in its forward position re leasing the bar 67. This action being completed and bar 5! having been released from the operating arm 53, the pin 54 is impelled in a forward direction by the operating spring 65. Assuming that the trigger 3 is still held in the fired position by the operators finger, the part 52 is held down and the pin 54 is arrested by the rear butting surface of the sear '68. The backward pull of the operators finger being released at this point will allow the spring 63 to swing part 5 upward pivoting on pin 33. This action returns the trigger 34 to its firing position and also raises pin 64 above the rear butting surface of sear The pin 64 now being free to move forward is actuated into the forward extended position by spring 65 so that it now will engage the rearward end of the sear fill. Bar 8'! and member 53 is also carried forward by this action.

Assuming that the pin 86 has been moved for-- I ward by the operating spring 65 and is in position to engage the rearward end of sear E6, the operator may now fire the left barrel by again exerting a backward pull on trigger 3 This will cause trigger 3 3 to pivot on pin 33 forcing part '62 downward. The pin 64 is also being carried downward by part 62 engaging sear 63 cans ing the sear to swing downward pivoting on pin 38 thus disengaging the hammer 58. The main hammer spring 59 imparts forward motion to the hammer 58 causing it to strike the firing pin til thus firing the left lower barrel.

It is necessary at this point to visualize all hammers in their respective fired positions as shown in Fig. 13. This being true the transverse safety bar 23 is still in the forward firing position and the forward extending portion of each hammer even though at rest in the forward ex treme position is not touching the rear surface of the cooking cam IT. This slight clearance is de sirable so as to prevent the forward end surface of the extended portion of the hammers to be peened over by repeatedly striking the rear surface of the cocking cam H.

Assuming now that all barrels have been fired and the hammers are in the fired positions it is desirable to open the firearm.

Referring to Fig. 1, the operator by applying a force on the locking lever .31 causes it to swing to the right pivoting in the opening in the top wall of the firing mechanism housing 4. The part 39 being rigidly secured to the lever 31 by screw 38 and the downward portions of lever 31 is rotated in a counterclockwise direction causing the rearward extended forked portion to compress spring 45. The pin 40 being threaded into an opening or otherwise attached securely to part 39 and extending downward into an elongated opening of the locking bar 4| as shown in Fig. 7, propels the locking bar 4| in a rearward direction withdrawing the forward extending portions of the locking bar 4| from the recessed openings in the rear surface of the barrel receiver During the rearward travel of the locking bar the hammer engaging lugs 85 engage the abutment of the right hammer 5| and the abutment of the left hammer 58. The continued movement of the lever 31 causes the locking bar 4| to move hammers 5|, 58 rearward slightly compressing the main hammer springs 52, 5?}. This allows the spring 57 to withdraw the firing pin 58 from the recess formed by the firing pin in the fired primer of the shell. Since the right firing pin and the left firing pin are identical, this same action takes place on the right hammer 5| and the right firing pin not shown in the drawings. The upper center firing pin 42 being mounted at such an angle and located so as to be greater distance above the pivot pin 3 allows the fired primer to act as a cam forcing firing pin 42 from the recess in the primer without the aid of the locking bar 4|.

Referring now in part to Fig. 1, 3, and 4. the locking bar 4| now being fully retracted the firearm is ready to be opened. As the firearm is opened the barrel receiver I pivots on pin 3 which is mounted in the forward end of the firing mechanism housing 4. The camming surface 5 on extended portion 5 at the forward end of the barrel receiver engages and moves the cocking cam l! in a rearward direction. The rear sur face of the cam makes contact with the forward ends of the forward extended portions of the hammers 21, 5|, 58. As the firearm is further opened the cocking cam forces the hammers 21, 5|, 58 rearward compressing the main hammer springs 3|, 52, 59. When the hammers have traveled a sufficient distance rearward so as to put the notches in the bottom surface of the hammers 21, 5|, 58 in alignment with the abutments of the respective sears 28, 49, 68 the springs 29, 50, 5| cause the scars 2B, 49, 5|] to swing upward pivoting on pin 35 into the notches in the bottom surface of the respective hammers 2?, 5|, 58. During this rearward travel of the hammer 5|, the single trigger operating arm 53 being securely mounted on the rearward extended portion of the hammer 5| is also carried rearward and having engaged the member 58 causes the bar 6'! to withdraw the pin 64 into the part 62 compressing the spring 65. At this point of the opening operation the safety push rod 2| being connected to the cocking cam IT by screw 22 has also moved rearward and now touches the transverse safety bar 23 which it must be noted is still in its forward firing posi-- tion. It must also be noted that the notches in the bottom surface of the hammers 21, 5|, 58 are so proportioned as to allow the hammers to continue rearward a further distance as the firearm is further opened. The safety push rod 2| having just touched the safety bar 23 and continuing its rearward travel moves the safety bar 23 rearward to the safety position during the above mentioned further opening of the firearm.

Referring briefly to Fig. 11 it can be seen that the hammer engaging portions of sears 28, 49 and 65 are in position to engage the lower abutments of hammers 21, 5| and 58 but said lower abutments are a distance to the rear of said hammer engaging portions. This displacement of said sears 28, 49 and 6|] and said hammers 21, 5| and 58 exists only at maximum opening of the firearm and is necessary to permit cocking cam if to move safety push rod 2| a distance rearward sufiicient to push safety bar 23 rearward out of vertical alignment with safety recesses of said sears 28, 19, 69. Since the safety finger piece 25 is secured to the safety bar 23 by screw 24 it also is moved to the safety position. The spring 25 at all times exerting a pressure in opening of trigger piece 35 provides a necessary friction for finger operation of the safety 26. The firearm is now in the extreme open position.

During the opening operation and while the above explained action has taken place the spring 20 has been compressed against pin "3. The extractor H has been moved out of the recessed opening It in the barrel receiver by the action of the extractor engaging the extractor cam i2. The locking bar 4| and the lever 3'1 have been returned to their forward extreme positions by the spring 46. The opening action having thus been completed the firearm is now ready to be closed.

A the barrel receiver continues to its closed position, the cocking cam progresses to its forward position and the main hammer springs SI, 52, 59 propel the respective hammers 2?, 5|, 58 in a forward direction until stopped and held in cocked position by the abutments of the respective sears 28, 49, 60. It is to be noted here that the single trigger operating arm 53 is now at rest in the cooked position thereby holding the pin 64 in its withdrawn (cocked) position in the part 52. The operating spring 2|) continues to move the cocking cam I! in a forward direction as the firearm is being closed. The safety push rod 2| being attached to the cooking cam I? is also moved forward.

As the barrel receiver continues to be closed the extractor is returned into the longitudinal opening in the barrel receiver by the camming action of the extractor against the forward surface of the firing mechanism housing 4. The locking bolt 4| being in its extreme forward position is forced rearward by the camming action of the rear surface of the barrel receiver causing the part 39 and unlocking lever 31 to be rotated counterclockwise against the spring 46. As the barrel receiver comes to rest in the closed position the recessed opening 8'! in its rear surface come into alignment with the locking bolt 4! allowing the spring 46 to return unlocking lever 31 and part 39 to closed position causing the locking bolt 4| to be moved into locked position by the pin 40. The barrel receiver is further held in position by two lugs such as lug and an identical lug on opposite side as shown in Fig. 2, by the recessed openings 8| and 82 in the firing mechanism housing 4 to receive said lugs.

The action now being completed, all part are in position as shown in the Figures 1, 2, 3, and 4:.

Referring now to Fig. 5, the take down rod 13 having a threaded part 15 threaded and pinned securely to the rearward end by a set screw or pin 14 i inserted through a longitudinal counterbored opening in the forearm TI. The part 16 is then attached to the forward end of the rod 73 and secured by a set screw or pin 17. The stud 8 is threaded or otherwise installed in the opening l of the forward extended portion of the barrel receiver I and firmly secured by a set screw or pin 72. The forearm 'li having the take down rod 73 installed and the barrel receiver end cap 69 attached to the rearward end can now be assembled to the barrel receiver 4 by sliding it rear- Wardly along the barrels so that the stud 3 passes through a longitudinal opening inthe forward wall of the barrel receiver end cap '69 and engages the threaded bore of the part l5.

Manipulation'of the take downrod 73 by turning part it will allow the forearm l! to be drawn rigidly to the barrel receiver I the part l5 drawing up against the barrel receiver end cap 69 which in turn is drawn up against the extended portion 5 of the barrel receiver, I.

The barrel housing 18 is mounted on the forward ends or the barrel and is secured by set screws or any other suitable means.

The part 83 is an optional rear sighting piece provided for the idiosyncrasies of the operator.

Referring now to Fig. 3 and Fig. l, the member has a longitudinal threaded bore in its rearward end to provide for a stock pull-rod not shown. The screw is is provided to insure the rigidity of the union of the stock (not shown) and the trigger frame 35 together with the firing mechanism housing 3.

I claim:

1. In a multiple barrel firearm, a sear for each barrel in substantially coplanar and parallel relation, said sear pivoted at one end and having hammer engaging portion at the other end, a hammer for each barrel in substantially coplanar and parallel relation with respect to a sear, a lower abutment on each hammer engaging the hammer engaging portion of each sear While in cocked position, a sear spring urging each sear into cocked position, a single trigger, a cross arm on said single trigger extending above and in back of the hammer engaging portion end of said sears, a projection from said cross arm extending over a scar to move said sear upon a pull of said trigger thereby releasing said hammer engaging portion from said lower aboutment on said hammer and firing the first barrel corresponding to said sear, a pivoted part in back of the abutment end of a sear corresponding to a second barrel and immediately under said trigger cross arm, a scar engaging pin in said pivoted part, a spring urging said pivoted part upward against said trigger cross arm thereby urging said trigger into cocked position, a spring urging said sear pin into a sear engaging position at all times, means for holding said sear pin into non-engaging position when the hammer of said first barrel is in a cocked position but releasing said sear pin for forward movement by said pin spring when said hammer is released, said sear pin kept from an engaging position by bearing against the rear end of said second barrel sear during movement of said pivoted part as the first barrel is fired but into an engaging position over the hammer engaging position end of said second barrel sear upon release of said trigger whereby a secand pull of said trigger will move said second sear and release the lower abutment of said second hammer from said hammer engaging position on said second barrel sear thereby firing said second barrel.

2. In a multiple barrel firearm, a scar for each barrel in substantially coplanar and parallel relation, said sear pivoted at one end and having hammer engaging portion at the other end, a

hammer for each barrel in substantially coplaner and parallel relation with respect to a sear, a lower abutment on each hammer engaging the hammer engaging portion of each sear while in cocked position, a scar spring urging each sear into cocked position, a single trigger, a cross arm on said single trigger extending above and in back of the hammer engaging portion end of said sears, a projection from said cross arm extending over a scar, to move said sear upon a pull of said trigger thereby releasing said hammer engaging portion from said lower abutment on said hammer and firing the first barrel corresponding to sear, a pivoted part in back 'of the abutment end of a sear corresponding to a second barrel andimmediately under said trigger cross arm, a scar engaging pin in said pivoted part, a spring urging said pivoted part upward against said trigger cross arm thereby urging said trigger into cocked position, a spring urging said sear pin into a scar engaging position at all times, means for holding said sear pin into non-engaging position when the hammer of said first barrel is in a cocked position but releasing said sear pin for forward movement by said pin spring when said hammer is fired, said sear pin kept from an engaging position by bearing against the rear end of said second barrel sear during the movement or" said pivoted part as the first barrel is fired but into an engaging position over the hammer engaging position end of said second barrel sear upon release of said trigger whereby a second pull of said trigger will move said second and release the lower abutment of said second hammer from said hammer engaging position on said second barrel sear thereby firing said second barrel, a safety recess adjacent to the pivoted end or' each sear, a safety bar displaced crosswise and in adjacent position with respect to said scars and means to move said safety bar beyond said safety recess when said firearm is opened thereby preventing any substantial movement of said sear, projecting means extending from said safety bar to manually move said bar from said safe position to a firing position by moving said bar into vertical alignment with said safety notches in said sears.

3. In a multiple barrel firearm having two lower barrels in a side-by-side relation and a top center barrel, sears for each barrel in substantially coplanar and parallel relation, said sears pivoted at one end and having hammer engaging portion at the other end, a hammer for each sear in substantially coplanar and parallel relation to its respective sear, a lower abutment in said hammer engaging said hammer engaging portion on said sear when in cocked position, a scar spring for each sear urging said sear into a cocked position, a single trigger, a crossarm on said single trigger extending transversely in back of and disposed above the abutment end of said sears, a projection on said cross arm over a sear corresponding to a first lower barrel to move said sear upon a pull of said single trigger so that said hammer engaging portion on said sear releases said hammer thereby firing said first lower barrel, a pivoted part in back of the abutment end of a sear corresponding to the second lower barrel and immediately under said trigger crossarm, a scar engaging pin in said pivoted part, a spring urging said pivoted part upward against said crossarm thereby urging said single trigger into cocked position, a pin spring urging said sear engaging pin into a sear engaging position at all times, means retaining said sear engaging pin against said pin spring in a non-engaging position when the hammer of said first lower barrel is in cocked position but releasing said sear engaging pin to be propelled forward by said pin spring when said hammer of said first lower barrel is fired, said pin spring kept from arriving at a sear engaging position by bearing against the rear end of a sear corresponding to said secand lower barrel during the downward movement of said pivoted part as the said lower barrel is fired and while said single trigger is held in a pulled position, said sear engaging pin propelled into a sear engaging position by said pin spring upon release of said single trigger thereby causing a second pull of said single trigger to move said second sear thereby releasing said hammer from said hammer engaging portion on said sear and firing said second lower barrel, a second trigger in substantially coplaner relation to a sear for said top center barrel, a sear engaging extension on said second trigger whereby a pull on said second trigger moves said sear from said hammer engaging portion on said sear thereby firing said upper center barrel.

4. In a firearm of the multiple barrel type, a barrel receiver having a pair of barrels connected thereto one beside the other, a firing mechanism housing pivotally connected to the barrel receiver, a pair of firing pins slidably mounted in a pair of openings in the forward wall of said firing mechanism housing together with a return spring, a trigger frame incorporated in said firing mechanism housing, a pair of hammers, a main spring for each hammer, one hammer having an arm mounted securely on its extreme rearward end disposed outside of the firing mechanism housing and extending transversely to the opposite side of the trigger frame, a forked portion at the end of the said arm and so proportioned so as to be in vertical alignment with the longitudinal medial axis of the other hammer, a sear for each hammer, a trigger to operate one sear directly, an auxiliary part associated with said trigger to allow indirect operation of the other sear, a slidable pin mounted longitudinally within the auxiliary part, a spring also mounted within the auxiliary part, urging said slidable pin in a forward direction at all times, a bar connected to said slidable pin and extending rearward so as to terminate within the said forked portion of said arm, a pin-like member rigidly fastened to said bar so as to engage the said forked portion of said arm and thereby retain said bar and said slidable pin in their rearward position until the aforementioned one hammer has been fired.

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